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lorasvet [3.4K]
2 years ago
11

12 liters of ammonia (NH3) weighs how much at room temperature and pressure (293 K and 100 kPa)?

Chemistry
1 answer:
andriy [413]2 years ago
5 0

Answer:

  • <u>Option D) 8.5 grams</u>

Explanation:

<u>1) Data:</u>

a) V = 12 liter

b) T = 293 K

c) p = 100 kPa

d) mass = ?

<u>2) Formulae:</u>

a) Ideal gas equation: pV = nRT

b) molar mass = mass in grams / number of moles

<u>3) Solution:</u>

a) <u>Calculate the number of moles of ammonia, n</u>:

  • pV = nRT ⇒ n = RT / (pV)

  • R = universal constant of gases = 8.3145 liter-kPa / mol-K

  • n = 100 kPa × 12 liter / (293 K × 8.3145 liter-kPa/mol-K) = 0.493 mol

b) <u>Convert moles to grams:</u>

  • Molar mass of NH₃ = 14.007 g/mol + 3×1.008 g/mol = 17.03 g/mol

  • mass = 0.493 mol × 17.03 g/mol = 8.4 g

Thus, the answer is the option D. 8.5 grams.

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2. If 2.50g of sodium hydroxide is being reacted with 4.30g of magnesium chloride, how many grams of magnesium hydroxide would b
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Answer:

1.822 g of magnesium hydroxide would be produced.

Explanation:

Balanced reaction: 2NaOH+MgCl_{2}\rightarrow Mg(OH)_{2}+2NaCl

     Compound                                 Molar mass (g/mol)

         NaOH                                           39.997

         MgCl_{2}                                           95.211

        Mg(OH)_{2}                                        58.3197

So, 2.50 g of NaOH = \frac{2.50}{39.997} mol of NaOH = 0.0625 mol of NaOH

      4.30 g of MgCl_{2}  = \frac{4.30}{95.211} mol of MgCl_{2} = 0.0452 mol of MgCl_{2}

According to balanced equation-

2 mol of NaOH produce 1 mol of Mg(OH)_{2}    

So, 0.0625 mol of NaOH produce (\frac{0.0625}{2}) mol of NaOH or 0.03125 mol of NaOH

1 mol of MgCl_{2} produces 1 mol of Mg(OH)_{2}

So, 0.0452 mol of MgCl_{2} produce 0.0452 mol of Mg(OH)_{2}

As least number of moles of Mg(OH)_{2} are produced from NaOH therefore NaOH is the limiting reagent.

So, amount of Mg(OH)_{2} would be produced = 0.03125 mol

                                                                           = (0.03125\times 58.3197) g

                                                                           = 1.822 g

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<h3><u>Answer;</u></h3>

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Answer:

Q=-697.06\ J

Negative sign says that release of heat.

Explanation:

The expression for the calculation of the heat released or absorbed of a process is shown below as:-

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\Delta H  is the heat released or absorbed

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